listening comprehension test

When a substance dissolves in water, you can’t see it anymore, it’s still there, but has mixed with the water to make a transparent liquid called a solution. Nonpolar molecules such as those found in grease or oil do not dissolve in water. Water molecules move about continuously due to their kinetic energy. When salt dissolves in water, it seems to disappear. The salt becomes a gas that is invisible to the naked eye. When the water evaporates from a mixture of salt and water, all of the original salt particles will remain. In salt solution, water is the solvent. At the end, when all the NaCl dissolves, the sodium (Na +) and chloride (Cl –) ions will each be surrounded by water molecules and will appear at microscopic level as: Dissolved sodium chloride. As a basic definition, salinity is the total concentration of all dissolved salts in water 4. They surround the particles of solute, gradually moving them away until the particles are evenly spread through the solvent. The salt can only dissolve in water when it comes into contact with the water and the contact takes place on the surface of the salt particles. 2. 3. These electrolytes form ionic particles as they dissolve, each with a positive and negative charge. A. During dissolving, particles of solvent collide with particles of solute. D. That is because at room temperature, the tiny particles that make up the water and salt move around and vibrate at higher speeds. Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions. B. Crystals of salt float to the top of the water where they cannot be seen. 3. As such, salinity is a strong contributor to conductivity. We will first examine the process that occurs when an ionic compound such as table salt (sodium chloride) dissolves in water. Sugar and salt are examples of soluble substances. The amount of a substance that candissolve in a liquid (at a particular temperature) is called the solubility ofthe substance. Well, a chemical change involves a chemical reaction, with new substances produced as a result of the change.A physical change, on the other hand, results in a change of the material's appearance, but no new chemical products result. We’re going to investigate which solids dissolve in water. The chemical name of table salt is sodium chloride. What happens to the salt that makes it no longer visible? And at the macroscopic and microscopic levels, it will appear like this: How sodium chloride dissolves This indicate that particles of matter have space between them. Crushing the salt up makes the particles of salt smaller so that the total surface area of the salt is larger than it was before the salt was crushed. We call substances that dissolve in water soluble. At 20 °C one liter of water can dissolve about 357 grams of salt, a concentration of 26.3%. 1. Salinity is an ambiguous term. When dissolving salt in water, the movement of and collision between the salt and water particles causes the particles to break apart. It is an ionic solid made of positively charged sodium ions and negatively charged chloride ions, which form a strong crystalline structure due to the electrical charges between them. C. The particles of the salt separate from each other and become surrounded by water molecules. This mixes the salt and water faster and makes the salt dissolve faster. Water typically dissolves many ionic compounds and polar molecules. It also indicates that the particles in water can diffuse with the particles of salt. When salt is mixed with water, the charged ions instead form weak hydrogen bonds with water molecules. A solvent is the substance that does the dissolving – it dissolves the solute. Neither salt nor water particles are destroyed. 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